Change switch to get-hints-url instead of get-hosts-url

Change-Id: Ia1ff9063898cd033bf0c3ea5e09e9d6ebcaccbd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001587
Auto-Submit: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731775}

components/optimization_guide/optimization_guide_switches.cc

@@ -39,7 +39,7 @@ const char kFetchHintsOverrideTimer[] =
 // Overrides the Optimization Guide Service URL that the HintsFetcher will
 // request remote hints from.
 const char kOptimizationGuideServiceGetHintsURL[] =
-    "optimization-guide-service-get-hosts-url";
+    "optimization-guide-service-get-hints-url";
 
 // Overrides the Optimization Guide Service URL that the PredictionModelFetcher
 // will request remote models and host features from.